La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Temporal variation in breeding and cone size selection by three species of crossbills Loxia spp. in a native Scots pinewood
Auteurs :	Ron W. Summers, Auteur ; Robert J. G. Dawson, Auteur ; Robert Proctor, Auteur
Type de document :	Article
Dans :	Journal of Avian Biology (41(3) MAY 2010)
Article en page(s) :	219-228
Langues:	Anglais
Résumé :	The breeding biology and cone size selection of crossbills was studied mainly during 1995 to 2002 at Abernethy Forest, Scotland, an ancient native Scots pine Pinus sylvestris wood, where only a single crossbill species, the Scottish crossbill Loxia scotica, was assumed to occur and to be adapted to feed on seeds in Scots pine cones. However, three crossbill species (common Loxia curvirostra, Scottish and parrot crossbills Loxia pytyopsittacus) nested in some years, with the parrot crossbill being the most abundant. Most nests were in old large pines, with the three crossbill species not differing in their use of tree size or stand density for nesting. The mean clutch and brood sizes were 3.8 and 2.9, and their mean survivals were 86 and 74%, respectively, with no significant differences among species. The timing of breeding differed between species, with parrot crossbills breeding earliest (median date

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